Add token string attribute to Poll Answer

app/models/poll/answer.rb

@@ -8,6 +8,7 @@ class Poll::Answer < ActiveRecord::Base
   validates :question, presence: true
   validates :author, presence: true
   validates :answer, presence: true
+  validates :token, presence: true
 
   # temporary skipping validation, review when removing valid_answers
   # validates :answer, inclusion: { in: ->(a) { a.question.valid_answers }},

db/migrate/20171006102811_add_token_to_poll_answer.rb

@@ -0,0 +1,5 @@
+class AddTokenToPollAnswer < ActiveRecord::Migration
+  def change
+    add_column :poll_answers, :token, :string
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171004151553) do
+ActiveRecord::Schema.define(version: 20171006102811) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -592,6 +592,7 @@ ActiveRecord::Schema.define(version: 20171004151553) do
     t.string   "answer"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.string   "token"
   end
 
   add_index "poll_answers", ["author_id"], name: "index_poll_answers_on_author_id", using: :btree